This is a quote from the book "The Gentleperson's Guide To Forum Spies" by Cryptome.org
...the number of replies and the answers that are provided much statistical information can be gathered. An example is to post your 'favourite weapon' and then encourage other members of the forum to showcase what they have. In this matter it can be determined by reverse proration what percentage of the forum community owns a firearm, and or a illegal weapon. This same method can be used by posing as one of the form members and posting your favourite 'technique of operation.' From the replies various methods that the group utilizes can be studied and effective methods developed ...
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